Large aircraft - smooth, fast, and soundless

My husband and I were at Cunningham Park, Queens lying on a picnic blanket on a patch of green near the Tennis Court. It was nearing sunset and I laid on my belly using my phone, while my husband laid on his back facing the sky. After some time, he nudged me and point up to the sky and as I looked and focused in, I could see a large oval space craft gliding past me-- smooth, fast, and soundless. As we were lying on the park ground, near the Tennis court wall, our view of it was blocked as it headed south and passed over the wall and many trees. The skies were grey-ish blue and the outline of the craft was only a tinge darker so we could spot it, however, it was so light "grey/silver" it looked translucent. We could see what looked like ridge patterns (for lack of a better word) on the bottom face of the craft but it moved so quickly, that was all we could gather. It was incredibly large, and considerately close to the ground, so what we both saw was undeniable.